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GNU Emacs CVE-2026-77219

| EUVDEUVD-2026-64138 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-08-21 VulnCheck GHSA-q8pr-2495-3jw7
Integer Overflow Information Disclosure Emacs
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.1 HIGH

AV:L because user must open a local file; UI:R for mandatory user interaction; PR:N since no elevated privileges are needed; C:H for heap disclosure; A:H for potential crash via out-of-bounds read.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Source Code Evidence Fetched
Aug 21, 2026 - 21:30 vuln.today
Analysis Generated
Aug 21, 2026 - 21:30 vuln.today

DescriptionCVE.org

GNU Emacs before 31.0.91 contains an integer overflow in the PBM/PPM/PGM image loader that allows an attacker to leak heap memory contents by supplying a crafted image with large dimensions and an elevated max color index. The image loader multiplies image dimensions and channel count using signed integer arithmetic; for sufficiently large values, the result wraps to a negative number, bypassing the bounds check and causing the pixel reader to access heap memory past the end of the allocated buffer. The over-read contents are interpreted as pixel color values and rendered on screen.

AnalysisAI

Integer overflow in GNU Emacs PBM/PPM/PGM image loader (all versions before 31.0.91) enables heap memory disclosure when a user opens a crafted image file. Signed integer multiplication of image height, width, and channel count wraps to a negative value for sufficiently large inputs, bypassing the allocated-buffer bounds check and allowing the pixel reader to over-read heap contents, which are then rendered on-screen as color values. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft PBM/PPM/PGM with extreme dimensions
Delivery
Deliver malicious image to target user
Exploit
User opens image in Emacs
Execution
Signed integer overflow wraps expected_size negative
Persist
Bounds check bypassed, heap over-read occurs
Impact
Heap memory rendered as pixel colors on screen
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target to open a specially crafted PBM, PPM, or PGM image file in a vulnerable GNU Emacs instance (any version before 31.0.91). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VA:H) places this at a score of 6.9, reflecting local attack vector with user interaction required but no privilege prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a PBM, PPM, or PGM image with extreme dimension values (e.g., width and height set near INT_MAX/3 to cause signed overflow after channel multiplication) and delivers it to a target via email attachment, shared filesystem, or download link. When the Emacs user opens the file - including inadvertently via file-manager preview or `M-x find-file` - the integer overflow bypasses the buffer bounds check, and the pixel reader fetches heap data beyond the allocated image buffer, rendering it on-screen as pixel colors. …
Remediation Upgrade GNU Emacs to version 31.0.91 or later; the patched release is available at https://github.com/emacs-mirror/emacs/releases/tag/emacs-31.0.91. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-77219 vulnerability details – vuln.today
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